Traceroute in Azure SSH Based

Question

May I know if there's a way how to traceroute the Google DNS in SSH Based of Azure? Everytime I configured the traceroute in SSH Based. The prompted is always like this

Answer 1

@Richelle Lanuza Thank you for reaching out to Microsoft Q&A.

Your Traceroute reaches the destination i.e., google.com as seen from the last hop (#23), it is successful. However, all the requests to the intermediate routers have timed out as seen from the above CMD prompt.

This happens because Traceroute by default uses ICMP and this ICMP packet (ping) was silently discarded by the intermediate routers. This happens because usually they are setup not to respond to ICMP packets. This is also true with Azure Network. This does not mean that the Traceroute did not succeed ad you can see the last hop reaches the destination and shows the RTT as well.

If you wish to see a better output i.e., responses from intermediate routers as well, try using TCP Traceroute- https://www.namecheap.com/support/knowledgebase/article.aspx/9777/2194/how-to-use-tcp-traceroute/

Hope this helps. Please let us know if you have any further questions and we will be glad to assist you further. Thank you!

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Answer 2

Hi @SaiKishor-MSFT Do have any idea, how to change the Default Gateway through SSH in Azure?

Answer 3

@Richelle Lanuza , you cannot change default gateway in Azure. Instead, you can create custom, or user-defined(static), routes in Azure to override Azure's default system routes.
Here is a ref doc that clearly explains about custom UDR setup for your subnet.

Also, In Azure Instead of Ping you should use PSping and for traceroute use NMAP as they use TCP port for detailed traffic route flows.

Note: Sometimes it blocks some part of the route, maybe when it hits the datacenter.

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